Determination of the number of light neutrino species from single photon production at LEP

dc.creatorDova, María Teresa
dc.creatorL3 Collaboration
dc.date1998-07-09
dc.date2019-05-10T13:15:04Z
dc.identifierhttp://sedici.unlp.edu.ar/handle/10915/74919
dc.identifierissn:0370-2693
dc.descriptionA determination of the number of light neutrino families performed by measuring the cross section of single photon production in eqey collision near the Z resonance is reported. From an integrated luminosity of 100 pby1 , collected during the years 1991–94, we have observed 2091 single photon candidates with an energy above 1 GeV in the polar angular region 458-u -1358. From a maximum likelihood fit to the single photon cross section, the Z decay width into invisible particles g is measured to be G s498"12 stat Ž . Ž. "12 sys MeV. Using the Standard Model couplings of neutrinos to the Z, the inv number of light neutrino species is determined to be N s2.98"0.07 stat Ž . Ž. "0.07 sys.
dc.descriptionFacultad de Ciencias Exactas
dc.formatapplication/pdf
dc.format199-208
dc.languageen
dc.rightshttp://creativecommons.org/licenses/by-nc-sa/4.0/
dc.rightsCreative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)
dc.subjectCiencias Exactas
dc.subjectFísica
dc.subjectlight neutrino species
dc.subjectphoton
dc.subjectLEP
dc.titleDetermination of the number of light neutrino species from single photon production at LEP
dc.typeArticulo
dc.typeArticulo


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